[issue2521] ABC caches should use weak refs

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Antoine, do you have a suggestion for someone with with better 
> knowledge of ABCs to do the final review, so that I may very politely 
> pester them? ;-)

I guess Benjamin could.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2521>
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